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    <title>Document</title>
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    <script>
        //数组是否包含某个值
        let a = ['a', 'b']
        let B = a.includes('a')
        console.log(B);
        //幂运算 **
        let c = 2//or Math.pow(2,10)
        console.log(2 ** 3);
    </script>
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